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# BIOSTAR MICROTECH INTERNATIONAL CORPORATION
MB-1425/33/40/50UCV-A
Processor CX486S/80486SX/80487SX/80486DX/ODP486SX/80486DX2/
Pentium Overdrive
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set Biostar
Max. Onboard 64MB
DRAM
Cache 32/64/128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (3)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | JP8 | Power LED & | JP15E |
| | | keylock | |
|------------------+----------+-------------------+----------|
| 5V ground | JP15A | Speaker | JP15F |
|------------------+----------+-------------------+----------|
| Turbo switch | JP15B | 32-bit VESA Local | V1 |
| | | bus slot | |
|------------------+----------+-------------------+----------|
| Reset switch | JP15C | 32-bit VESA Local | V2 |
| | | bus slot | |
|------------------+----------+-------------------+----------|
| Turbo LED | JP15D | 32-bit VESA Local | V3 |
| | | bus slot | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | CMOS memory normal operation | JP8 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP8 | pins 3 & 4 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Power good signal detect from | JP11 | pins 1 & 2 |
| | power supply | | closed |
|---+----------------------------------+--------+------------|
| | Power good signal detect from | JP11 | pins 2 & 3 |
| | board | | closed |
|---+----------------------------------+--------+------------|
| » | One CPU (PQFP or PGA) on board | JP12 | pins 1 & 2 |
| | installed | | closed |
|---+----------------------------------+--------+------------|
| | Two CPUs (enabled PGA and | JP12 | pins 2 & 3 |
| | disabled PQFP) on board | | closed |
| | installed | | |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | JP14 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP14 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Add on card select normal | JP28 | pins 1 & 2 |
| | operation | | closed |
|---+----------------------------------+--------+------------|
| | Add on card select Weitek 9000 | JP28 | pins 2 & 3 |
| | VGA card installed | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (4) 1M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 17MB | (4) 4M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Max | Bank 0 | Bank 1 | TAG |
| | Cachable | | | |
|-------+-------------+------------+------------+------------|
| 32KB | 8MB | (4) 8K x 8 | NONE | (1) 8K x 8 |
|-------+-------------+------------+------------+------------|
| 64KB | 16MB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|-------+-------------+------------+------------+------------|
| 128KB | 32MB | (4) 32K x | NONE | (1) 8K x 8 |
| | | 8 | | |
|-------+-------------+------------+------------+------------|
| 256KB | 64MB | (4) 32K x | (4) 32K x | (1) 16K x |
| | | 8 | 8 | 8 |
|-------+-------------+------------+------------+------------|
| 256KB | 64MB | (4) 32K x | (4) 32K x | (1) 32K x |
| | | 8 | 8 | 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP5 | JP6 | JP7 | JP9 | JP10 |
|-------+------------+----------+--------+--------+----------|
| 32KB | pins 2 & 3 | Open | Open | Open | Open |
|-------+------------+----------+--------+--------+----------|
| 64KB | pins 1 & 2 | Open | Open | Closed | Open |
|-------+------------+----------+--------+--------+----------|
| 128KB | pins 2 & 3 | pins 2 & | Closed | Closed | Open |
| | | 3 | | | |
|-------+------------+----------+--------+--------+----------|
| 256KB | pins 1 & 2 | pins 1 & | Closed | Closed | pins 2 & |
| | | 2 | | | 3 |
|-------+------------+----------+--------+--------+----------|
| 256KB | pins 1 & 2 | pins 1 & | Closed | Closed | pins 1 & |
| | | 2 | | | 2 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP16 | JP17 |
|-------------------+-------------------+--------------------|
| CX486S | Open | pins 2 & 3 closed |
|-------------------+-------------------+--------------------|
| 80486SX | Open | pins 2 & 3 closed |
|-------------------+-------------------+--------------------|
| 80487SX | pins 2 & 3 closed | pins 1 & 2 and 3 & |
| | | 4 closed |
|-------------------+-------------------+--------------------|
| 80486DX | pins 1 & 2 closed | pins 1 & 2 and 3 & |
| | | 4 closed |
|-------------------+-------------------+--------------------|
| ODP486SX | pins 2 & 3 closed | pins 1 & 2 and 3 & |
| | | 4 closed |
|-------------------+-------------------+--------------------|
| 80486DX2 | pins 1 & 2 closed | pins 1 & 2 and 3 & |
| | | 4 closed |
|-------------------+-------------------+--------------------|
| Pentium Overdrive | pins 1 & 2 closed | pins 1 & 2 and 3 & |
| | | 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP21 | JP22 | JP23 | JP27 |
|------------+-----------+-----------+-----------+-----------|
| 25MHz | Closed | Open | Closed | Open |
|------------+-----------+-----------+-----------+-----------|
| 33MHz | Closed | Closed | Open | Open |
|------------+-----------+-----------+-----------+-----------|
| 40MHz | Open | Open | Closed | Closed |
|------------+-----------+-----------+-----------+-----------|
| 50i MHz | Closed | Open | Closed | Open |
|------------+-----------+-----------+-----------+-----------|
| 50MHz | Open | Closed | Open | Closed |
|------------+-----------+-----------+-----------+-----------|
| 66i MHz | Closed | Closed | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| Mode | JP19 | JP20 | JP25 | JP26 | JP29 | JP30 |
| | | | (V2) | (V1) | (V3) | (V2 |
| | | | | | | & |
| | | | | | | V3) |
|--------------+-------+-------+-------+-------+------+------|
| Synchronous | pins | pins | pins | pins | pins | pins |
| | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & | 1 & |
| | | | | | 2 | 2 |
|--------------+-------+-------+-------+-------+------+------|
| Asynchronous | pins | pins | pins | pins | pins | pins |
| | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & | 2 & |
| | | | | | 3 | 3 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
| |
| When V2 & V3 are used at the same time, JP25 must be left |
| open. |
+------------------------------------------------------------+